Trigonometric Sum and Difference Identities Exam Questions Answered Correctly Latest Update

Trigonometric Sum and Difference Identities Exam Questions Answered Correctly Latest Update 2025-
2026

Angle Sum Identity for Cosine - Answerscos(α + β) = cos α cos β - sin α sin β

Angle Sum Identity for Sine - Answerssin(α + β) = sin α cos β + cos α sin β

Angle Sum Identity for Tangent - Answerstan(α + β) = (tan α + tan β) / (1 - tan α tan β)

Angle Difference Identity for Cosine - Answerscos(α - β) = cos α cos β + sin α sin β

Angle Difference Identity for Sine - Answerssin(α - β) = sin α cos β - cos α sin β

Angle Difference Identity for Tangent - Answerstan(α - β) = (tan α - tan β) / (1 + tan α tan β)

Cofunction Identity for Cosine - Answerscos(π/2 - α) = sin α

Cofunction Identity for Sine - Answerssin(π/2 - α) = cos α

Cofunction Identity for Tangent - Answerstan(π/2 - α) = cot α

Cofunction Identity for Secant - Answerssec(π/2 - α) = csc α

Cofunction Identity for Cosecant - Answerscsc(π/2 - α) = sec α

Cofunction Identity for Cotangent - Answerscot(π/2 - α) = tan α

Cofunction Identity for Cosine in Degrees - Answerscos(90° - α) = sin α

Cofunction Identity for Sine in Degrees - Answerssin(90° - α) = cos α

Cofunction Identity for Tangent in Degrees - Answerstan(90° - α) = cot α

Cofunction Identity for Secant in Degrees - Answerssec(90° - α) = csc α

Cofunction Identity for Cosecant in Degrees - Answerscsc(90° - α) = sec α

Cofunction Identity for Cotangent in Degrees - Answerscot(90° - α) = tan α